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From Anna Södling <>
Subject Re: [SCXML] Log output?
Date Wed, 25 Mar 2009 13:39:22 GMT
> Hi, 
> I want to use some logging in my scxml-file, for example upon entering
> and exiting a state. Unfortunately, I can't seem to get the hang of
> it works. I've got this line in my scxml-file: 
> And the log output I get (in a console window in Eclipse) looks like 
> this: 
> 2009-mar-24 11:39:08 org.apache.comm 
> ons.scxml.model.Log execute 
> INFO: 'Renegade': Entering state: A 
> 2009-mar-24 11:39:08 org.apache.commons.scxml.model.Log execute 
> INFO: 'Renegade': Entering state: A 

That seems OK to me (other than the fact it appeared twice, probably a 
cut-n-paste error?). 

No, it was supposed to enter state A twice during the running of the
state machine...though I guess I didn't really have to paste both
outputs :) 
However, I'm wondering if there is some way to "clean up" the output? If
possible, I would like to remove the "org.apache.commons.scxml.model.Log
execute" and put the date and info on the same row. 

> Also, I'm doing some ordinary printed outputs (in Java) while I'm 
> running my state machine, and the log info is not placed on the right 
> place among these outputs either, but before all of them (so it
> show up when I'm actually entering the state). 
> And that's not really what I wanted. I would simply like to have an 
> output that says "'Renegade': Entering state: A" (or something
> when I'm actually entering state A. Is this possible? Or have I 
> missunderstood how the -tag works? 

Please say more about the Java code which contains these print 
statements. Are you using an AbstractStateMachine subclass, an 
SCXMLListener or something else? ( content in the SCXML 
document executes before code in both those specific cases). 

We're using an AbstractStateMachine...we haven't extended it (since this
didn't work for some reason), but rather copied it and added some parts.
But it's a kind of ASM very similar to the original. 
We have a little problem with this line of code in the onentry-listener
Without it, we only get the original output, but when we add it, we get
a whole lot of error messages. We're not sure what it is doing, or

If you want more fine-grained control about the timing of your 
procedural code within state changes (or sequencing even within a 
particular or ), that kind of thing can be achieved 
by using custom actions [1] to call your code from the appropriate 
place(s) in SCXML executable content. 

We've tried with several log expressions, some in onentry-tags, and some
not. Even though they're not shown exactly where we want to, they seem
to be shown in the right order. But, is this maybe a coincidence? 



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